Removable bearing cover

ABSTRACT

A bearing cover is provided for attachment relative to a bearing assembly. The cover includes a flange and a magnet associated with the flange. The magnet is configured to removably retain the bearing cover relative to the bearing assembly.

CROSS REFERENCE TO RELATED APPLICATIONS

The present application claims the benefit of and priority from U.S.Provisional Patent Application Ser. No. 61/576,226, filed Dec. 15, 2011,the entire disclosure of which is hereby incorporated by referenceherein.

BACKGROUND OF THE INVENTION

1. Field of the Invention

The present invention relates generally to a bearing cover for removableattachment to a bearing assembly, wherein the bearing assembly rotatablysupports a shaft. More particularly, the present invention relates to abearing cover including magnets configured to removably retain thebearing cover relative to the bearing assembly such that the shaft is atleast in part received within the bearing cover and the bearing assemblyis at least in part covered by the bearing cover.

2. Discussion of the Prior Art

Those of ordinary skill in the art will appreciate that bearingassemblies used to support shafts present numerous problems. Forexample, it important to prevent ingress of dirt or particles into thebearing assembly. A rotating shaft section typically projects outwardlyfrom the bearing assembly, and it is important to reduce the risk ofclothing or other appendages getting caught in or otherwise damaged bythe rotating shaft. Yet further, bearing assemblies are oftenlubricated, and it is highly desirable to prevent leakage of lubricantsfrom the bearing assembly into the surrounding environment.

These problems become magnified in tight quarters and/or in “clean”environments, such as with food processing equipment. However, it isalso important to keep in mind that these bearing assemblies must bereplaced or maintained, and it is therefore desirable for the assemblyto be readily accessible.

SUMMARY

According to one aspect of the present invention, a bearing cover isprovided for attachment relative to a bearing assembly, wherein thebearing assembly rotatably supports a shaft that projects outwardly fromthe bearing assembly. The bearing cover includes a flange, an outer wallspaced outwardly from the flange, an at least substantially continuousside wall extending between and interconnecting the outer wall and theflange, and a magnet associated with the flange. The side wall and theouter wall at least in part cooperatively define an interior space. Themagnet is configured to removably retain the bearing cover relative tothe bearing assembly such that the bearing assembly is at least in partcovered by the bearing cover.

According to another aspect of the present invention, a mechanism isprovided. The mechanism includes a shaft, a bearing assembly rotatablysupporting the shaft, and a bearing cover removably attached relative tothe bearing assembly. The shaft projects outwardly from the bearingassembly. The bearing cover includes a flange, an outer wall spacedoutwardly from the flange, an at least substantially continuous sidewall extending between and interconnecting the outer wall and theflange, and a magnet associated with the flange. The side wall and theouter wall at least in part cooperatively define an interior space. Themagnet removably retains the bearing cover relative to the bearingassembly such that the bearing assembly is at least in part covered bythe bearing cover.

This summary is provided to introduce a selection of concepts in asimplified form. These concepts are further described below in thedetailed description of the preferred embodiments. This summary is notintended to identify key features or essential features of the claimedsubject matter, nor is it intended to be used to limit the scope of theclaimed subject matter.

Various other aspects and advantages of the present invention will beapparent from the following detailed description of the preferredembodiments and the accompanying drawing figures.

BRIEF DESCRIPTION OF THE DRAWING FIGURES

Preferred embodiments of the present invention are described in detailbelow with reference to the attached drawing figures, wherein:

FIG. 1 is a fragmentary perspective view of a conveyor system includingbearing covers constructed in accordance with the principles of a firstembodiment of the present invention;

FIG. 2 is an enlarged fragmentary side view of a portion of the conveyorsystem of FIG. 1, particularly illustrating the outer side of a bearingcover attached to a bearing assembly;

FIG. 3 is a cross-sectional side view of a bearing assembly, a bearingcover, and a shaft of the conveyor system of FIGS. 1 and 2; and

FIG. 4 is an expanded fragmentary perspective view of a conveyor systemincluding a bearing assembly, a bearing cover, and a shaft constructedin accordance with a second embodiment of the present invention.

The drawing figures do not limit the present invention to the specificembodiments disclosed and described herein. The drawings are notnecessarily to scale, emphasis instead being placed upon clearlyillustrating the principles of the preferred embodiments.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

The present invention is susceptible of embodiment in many differentforms. While the drawings illustrate, and the specification describes,certain preferred embodiments of the invention, it is to be understoodthat such disclosure is by way of example only. There is no intent tolimit the principles of the present invention to the particulardisclosed embodiments.

With initial reference to FIG. 1, a conveyor system 10 is illustrated.Preferably, the conveyor system 10 is for use in a food handlingenvironment. For instance, in a preferred embodiment, the conveyorsystem transports food products through a food processing facility.

The conveyor system 10 preferably includes a belt 12 carried on aplurality of rollers 14 extending between frame walls 16. Each roller 14is preferably supported on a pair of stub shafts 18 having respectiveends 20 and endmost margins 22. Each stub shaft 18 preferably extendsoutwardly through a respective one of the frame walls 16. The shafts 18are preferably rotatably supported by respective bearing assemblies 24mounted on the respective frame walls 16, such that each roller 14 issupported by a pair of bearing assemblies 24. Each bearing assembly 24is preferably at least in part covered by a bearing cover 26.

In an alternative embodiment, each roller is supported on a single shaftextending through the roller and past its ends. The single shaft ispreferably rotatably supported by a pair of bearing assemblies mountedon respective ones of the frame walls, such that each roller issupported by a pair of bearing assemblies. Each bearing assembly ispreferably at least in part covered by a bearing cover.

Each bearing assembly 24 preferably includes a stationary housing 28 anda shaft component 30 fixed to the shaft 18 for rotational movementtherewith. The bearing assembly 24 preferably further includes an insert(not shown) that rotatably supports the shaft component 30 and, in turn,the shaft 18. Preferably, the insert includes ball bearings. However, itis within the scope of the present invention for any type of bearingassembly and, in turn, any type of insert (e.g., a journal sleeve) to beused. Furthermore, it is permissible for more than one type of bearingassembly to be used throughout the conveyor system 10.

As best shown in FIG. 1, each housing 28 preferably includes a body 32and a plurality of protrusions 34 extending from the body 32.Preferably, two of the protrusions 34 are provided and are spaced 180degrees from each other. It is permissible, however, for any number ofprotrusions to be provided, with both even and uneven spacing betweenthe protrusions being acceptable.

Each of the protrusions 34 preferably defines a fastener-receivingopening (not shown), although it is permissible for such openings to notbe provided.

Preferably, the body 32 is circularly annular (i.e., having an outermargin defining a circle and an inner margin defining a circle),although other shapes are permissible. The body might have inner andouter margins each defining a square, a rectangle, or some otherpolygon, for instance; or each of the inner and outer margins mightdefine a different shape.

Furthermore, the housing might be configured in an entirely differentmanner in keeping with the type of bearing best suited for theparticular application. For instance, the housing might be base-mountedrather than flange-mounted.

Each housing 28 preferably comprises metal. More particularly, eachhousing 28 preferably comprises a ferromagnetic metal such as iron orsteel.

A fastener 36 preferably extends through each fastener-receiving openingand into and through a corresponding opening (not shown) in therespective frame wall 16. In a preferred embodiment, each fastener 36includes a bolt 38 and a nut 40, but any fastening means known in theart may be utilized without departing from the spirit of the presentinvention. For instance, each housing 28 might be attached to thecorresponding frame walls 16 using screw, clips, adhesives, welding, ora combination of attachment means.

Each bearing cover 26 preferably includes a flange 42 and an outer wall44 spaced outwardly from the flange. A side wall 46 preferably extendsbetween and interconnects the flange 42 and the outer wall 44. The sidewall 46 and the outer wall 44 preferably define an interior space 48(FIG. 3).

Each flange 42 is preferably circularly annular, each outer wall 44 ispreferably circular, and each side wall 46 is preferably cylindrical.However, it is within the ambit of the present invention for a differentshape to be used for one or more of the components. For instance, theouter wall might be sized smaller than the inner diameter of the flangesuch that the side wall forms a frustum of a cone in order tointerconnect them; or the flange and outer wall might be polygonaland/or vary in shape from each other, as well.

In a preferred embodiment, a smoothed or chamfered region 50 is formedat the intersection of the side wall 46 and the outer wall 44 of eachcover 26. As best shown in FIG. 3, the region 50 preferably definessmooth edges. However, it may alternatively define sharp edges. It isalso permissible for an abrupt connection to be made instead, or for theside wall and outer wall to be continuously transitioning into eachother so as to form a smooth, dome-like structure.

Each cover 26 may be of any size, and its components may have anyrelative dimensions necessary for the chosen application. For instance,the space between the outer wall 44 and the flange 42 (that is bridgedby the side wall 46) might be made very small relative to the size ofthe flange 42; the diameter of the side wall 46 might be increasedrelative to the outer diameter of the flange 42; or the width of theflange 42 might be increased or decreased relative to the size of theremaining components of the cover 26.

One or more of the covers may be provided with an attachment (not shown)for oil misting of an exposed bearing, if required, or could includeopenings (not shown) through which a lubricant could be injected into toonto a bearing assembly.

The covers may also each be provided with ventilation openings (notshown) to facilitate improved cooling of the corresponding bearingassemblies 24.

A pair of fastener-accommodating slots 52 are preferably formed in eachflange 42. The slots 52 are preferably at least substantiallysemi-circular in form, although other shapes are permissible. The slots52 are configured such that the fasteners 36 may be at least in partaccommodated therein without interfering with the cover 26 and, moreparticularly, with the side wall 46 and the outer wall 44.

As shown in FIG. 3, the bearing cover 26 preferably includes a pluralityof magnets 54. Preferably, four magnets are provided, although anynumber may be used without departing from the spirit of the presentinvention. For example, the cover may alternatively include a singlemagnet (e.g. an arcuate shaped magnet, ring magnet, etc.) formagnetically coupling the cover in the desired manner.

In a preferred embodiment, the magnets 54 are spaced about the flange42. Preferably, the magnets 54 are spaced evenly about flange 42,although uneven spacing is permissible without departing from the scopeof the present invention. It is also possible for all or some of themagnets 54 to be placed in or on other portions of the cover 26,including in or on the side wall 46 and/or the outer wall 44.

In a preferred embodiment and as best illustrated in FIG. 3, the magnets54 are embedded in the flange 42 so as to be encapsulated in the flange42 (e.g., molded within). It is permissible, however, for the magnets 54to be attached to or placed on or within the flange 42 by any meansknown in the art. The magnets might be glued or otherwise adhered to theouter surface of the flange, for instance, or they could be secured inrecesses formed in the flange so as to be embedded but not encapsulated.

The magnets 54 are preferably permanent, rare earth magnets. Mostpreferably, the magnets 54 are neodymium magnets. However, it ispermissible for any type of magnets to be used.

The magnets 54 are preferably circular disks. However, the magnets maybe of any shape and size required to best fit the application withoutdeparting from the scope of the present invention. The shape and sizemay also vary between the magnets.

As shown in FIGS. 1-3, the magnets 54 in each flange 42 preferablyengage the housing 28 of the corresponding bearing assembly 24 such thatthe bearing cover 26 is removably retained on the housing 28. However,it is possible for the bearing cover to be configured for attachment tostructure other than the bearing housing. For instance, the cover couldbe configured for attachment to the frame wall. Attachment to more thanone structure is permissible, as well. The cover could include two setsof magnets, for instance, with one set engaging the housing and theother set engaging the frame wall.

Preferably, the body 32 of the housing 28 is at least substantiallycovered by the bearing cover 26. Even further, the end 20 of the shaft18 is preferably at least substantially received within the interiorspace 48. Most preferably, the shaft 18 extends so that the endmostmargin 22 of the shaft 18 is positioned immediately adjacent (but not incontact with) the outer wall 44.

It is also preferable that at least a portion of the shaft component 30of the bearing assembly 24 is received within the interior space 48,with the bearing assembly 24 as a whole being at least substantiallycovered by the bearing cover 26. It is permissible, however, foralternative arrangements to be made without departing from the spirit ofthe present invention. For instance, a bearing assembly lacking anoutward projection such as the illustrated shaft component 30 might notbe received within the interior space 48, instead simply being coveredby the bearing cover 26. In certain embodiments, the shaft 18 might alsofail to extend into the interior space 48.

Provision of the bearing covers 26 is highly advantageous. For instance,a person near the conveyor system 10 is at least substantially protectedfrom the risk of having his or her clothing caught up by one of therotating shafts 18 or being otherwise injured by the rotating shafts 18.In applications in which water spray, other liquids, dust, and/or otherparticulate present in the environment (e.g., during high pressurecleaning) need to be kept out of at least part of each of the bearingassemblies 24, the covers 26 provide a barrier against ingress into theinterior space 48 and into or onto at least part of the correspondingbearing assemblies 24. Such barrier ability also allows for use ofbearings requiring regular maintenance (e.g., regular greasing), ratherthan more expensive sealed bearings that might otherwise be preferred.In a food processing environment, food being conveyed on the belt 12 isat least substantially protected from contamination due to the transferor leakage of the bearing lubricant (e.g., grease or oil) and/or by thedisplacement of wear particles from the bearing assemblies and/orshafts.

Provision of the magnets 54 as a means of attaching each bearing cover26 to the housing 28 of each corresponding bearing assembly 24 providesnumerous advantages. For instance, attachment and removal of each cover26 can be done without use of tools. This enables quicker attachment andremoval, leading to decreased inspection and maintenance times andassociated costs. Lack of tool requirements also decrease the likelihoodthat a tool will be dropped on to the conveyor belt 12 and jam theconveyor system 10, contaminate food carried thereon, and/or be packagedinto a product on the line. Furthermore, the ease with which the cover26 can be attached and removed will encourage more frequent inspectionof the bearing assemblies 24 (more particularly, more frequent checks ofthe lubrication of the bearing assemblies 24), potentially leading tomore timely maintenance and, in turn, better performance of the conveyorsystem 10.

Provision of the magnets 54 as a means of attaching each bearing cover26 to the housing 28 of the corresponding bearing assembly 24 alsoenables the elimination of additional fastening means such as nuts andbolts. While such additional fastening means may still be providedwithin the scope of the present invention, they would in a preferredembodiment be eliminated. Elimination of discrete fasteners forattaching each bearing cover 26 to the corresponding housing 28 would,among other things, decrease the likelihood that a fastener componentwill be dropped on to the conveyor belt 12 and jam the conveyor system,contaminate food carried thereon, and/or be packaged into a product onthe line.

Furthermore, provision of the magnets 54 as a means of attaching eachbearing cover 26 to the housing 28 of the corresponding bearing assembly24 also enables the elimination of the hinge commonly associated withconventional bearing covers. More particularly, conventional bearingcovers typically include a plastic hinge about which the cover pivotswhen it is opened for inspection. If and when the hinge breaks,replacement of the cover is required, leading to expenses both in termsof time costs and material costs.

Preferably, the bearing cover 26 comprises plastic, although any one ormore of a variety of materials may be used without departing from thescope of the present invention. The cover 26 may also suitably be of anycolor or of several colors and may include any markings deemed suitable.

As shown in FIG. 3, the bearing cover 26 preferably further includesparticles 56 embedded in the plastic. The particles 56 are preferablymetal particles. The plastic may, in some embodiments, therefore bereferred to as a metal-filled plastic.

In a preferred embodiment, the particles 56 are at least substantiallyevenly distributed throughout the cover 26, although an unevendistribution is permissible without departing from the scope of thepresent invention.

Provision of the particles 56 is highly advantageous. For instance, ifcircumstances were to arise in which the bearing cover 26 is damaged anda portion thereof is broken loose or otherwise separated and falls intoa food product on the conveyor belt 12, the presence of the metalparticles 56 in the broken-loose portion would enable the portion to bedetected by a metal detector scanning each food product as it passes bythe metal detector. Such a detector might be placed along the conveyorbelt 12 or in another location through which the product passes duringthe normal processing procedure. The contaminated food could then beremoved from the system to avoid spread of the contamination.

A second preferred embodiment of the present invention is illustrated inFIG. 4. It is initially noted that, with certain exceptions to bediscussed in detail below, many of the elements of the bearing cover ofthe second embodiment are the same as or very similar to those describedin detail above in relation to the bearing of the first embodiment.Therefore, for the sake of brevity and clarity, redundant descriptionsand numbering are generally avoided here. Unless otherwise specified,the detailed descriptions of the elements presented above with respectto the first embodiment should therefore be understood to apply at leastgenerally to the second embodiment, as well.

As shown in FIG. 4, a conveyor system 110 including a roller 112 isprovided. The conveyer system 110 also includes a shaft 114 having anend 116, a bearing assembly 118 rotatably supporting the shaft 144 andincluding a housing 120, and a bearing cover 122 for removableattachment to the housing 120 of the bearing assembly 118.

Preferably, the bearing cover 122 at least substantially covers thebearing assembly 118 and the end 116 of the shaft 114 when the cover 122engages the housing 120.

The bearing cover 122 preferably includes a flange 124 and a pluralityof magnets 126 spaced about the flange 124. The bearing cover 26preferably includes three of the magnets 126, spaced evenly about theflange 124.

The housing 120 preferably defines a pair of fastener-receiving openings128 therethrough. Preferably, the bearing cover 122 and the bearinghousing 120 are configured such that fasteners can be inserted into thefastener-receiving openings 128 in the housing 120 without interferingwith the cover 122 and, more particularly, with the flange 124. Such aconfiguration enables the flange 124 to present a constant,circumferentially continuous cross-section

Although the above description presents features of preferredembodiments of the present invention, other preferred embodiments mayalso be created in keeping with the principles of the invention.Furthermore, as noted previously, these other preferred embodiments mayin some instances be realized through a combination of featurescompatible for use together despite having been presented independentlyas part of separate embodiments in the above description.

The preferred forms of the invention described above are to be used asillustration only and should not be utilized in a limiting sense ininterpreting the scope of the present invention. Obvious modificationsto the exemplary embodiments, as hereinabove set forth, could be readilymade by those skilled in the art without departing from the spirit ofthe present invention.

The inventor hereby states his intent to rely on the Doctrine ofEquivalents to determine and access the reasonably fair scope of thepresent invention as pertains to any apparatus not materially departingfrom but outside the literal scope of the invention set forth in thefollowing claims.

What is claimed is:
 1. A mechanism comprising: a shaft; a bearingassembly rotatably supporting the shaft, with the shaft projectingoutwardly from the bearing assembly along an axis to present a shaft endhaving an axially endmost shaft margin; and a bearing cover removablyattached relative to the bearing assembly, said bearing cover including:a flange, an outer wall spaced axially outwardly from said flange, an atleast substantially continuous side wall extending between andinterconnecting the outer wall and the flange, and a magnet associatedwith the flange, said side wall and the outer wall at least in partcooperatively defining an interior space, said shaft end being receivedin the interior space such that the endmost shaft margin is positionedin the interior space, said magnet removably retaining the bearing coverrelative to the bearing assembly such that the bearing assembly is atleast in part covered by the bearing cover, said bearing covercomprising a non-magnetizable material, said bearing cover furthercomprising metal particles embedded in the material, said particlesbeing dispersed throughout the bearing cover so that the bearing coveror a separated portion of the bearing cover is detectable by a metaldetector.
 2. The mechanism as claimed in claim 1, said magnet beingembedded in the flange.
 3. The mechanism as claimed in claim 2, saidmagnet including a plurality of magnets spaced evenly about the flange.4. The mechanism as claimed in claim 1, said side wall being at leastsubstantially cylindrical, said outer wall being at least substantiallycircular, said flange being at least substantially annular.
 5. Themechanism as claimed in claim 1, said bearing assembly including a shaftcomponent fixed to the shaft for rotational movement therewith, saidbearing assembly including a stationary bearing housing that supportsthe shaft component, said flange engaging the bearing housing.
 6. Themechanism as claimed in claim 5, said bearing housing defining afastener-receiving opening therethrough, said flange defining afastener-accommodating slot therein, said fastener-accommodating slotand said fastener-receiving opening being at least substantiallyaligned, said mechanism further comprising a fastener at least in partextending through the fastener-accommodating slot and thefastener-receiving opening.
 7. The mechanism as claimed in claim 5, saidshaft component being at least substantially received within theinterior space.
 8. The mechanism as claimed in claim 1, said outer wallbeing immediately adjacent the endmost shaft margin.
 9. The mechanism asclaimed in claim 1, said cover comprising plastic.
 10. The mechanism asclaimed in claim 1, said magnet being a rare earth magnet.
 11. Themechanism as claimed in claim 10, said magnet being a neodymium magnet.